JavaScript Tutorial

Learn JavaScript step by step with this detailed JavaScript tutorial which is designed for beginners and advanced learners. It covers the concepts like syntax, variables, data types, control statements, functions, objects, DOM manipulation, events, promises, async/await, error handling, cookies, JSON, and OOPs, with clear explanations and practical examples to help you build real-world web applications.

What is JavaScript?

JavaScript (JS) is a programming language that lets developers create interactive web pages. JavaScript is a lightweight, object-oriented programming language that is used by several websites for scripting webpages.

JavaScript is an interpreted language that executes code line by line, providing more flexibility. It is a single-threaded language that executes one task at a time. JavaScript builds upon other programming languages, updating them based on user interactions and other input.

JavaScript First Program: Hello World Program

Here is the code for the Hello World Program. You can run this code by clicking on the "Execute JavaScript Code" button to see the output.

Why learn JavaScript?

• Easy to Learn: JavaScript is beginner-friendly and easier to learn than many other programming languages.
• Versatility: JavaScript can be used to develop websites, and you can use it on both the server side and client side using Angular expressjs and Node.js.
• Client Side: JavaScript is the main language for client-side logic and is supported by almost all browsers. It also offers several frameworks and libraries such as ReactJS, AngularJS, and js.
• Server Side: It is widely used for building server-side applications because it offers runtime environments like Node.js and frameworks like Express.js.
• Build Games: You can use JavaScript to create games, which can be 2D or 3D.

Features of JavaScript

There are many features of JavaScript, which are as follows:

Lightweight

JavaScript is a lightweight programming language that is made for handling data on the client side. It has a minimal runtime and low resource requirements.

Dynamic Typing

JavaScript is a dynamic-typing language, which means variable types are specified on the basis of the stored values. It means that developers don't need to specify the type of a variable before assigning a data type to it.

Object-oriented programming

In JavaScript, object-oriented programming languages are similar to objects. It has methods and properties that can be accessed and used in different ways. With the help of this feature, developers can create the complex data structures and algorithms that are necessary for making modern online apps.

Prototype Based

JavaScript is a prototype-based language, which means it utilizes prototypes in place of classes. We can specify an object prototype, and after that, we can construct more objects with the help of the specified object prototype.

Interpreted Language

JavaScript is an interpreted language, which means it executes the code line by line. A JavaScript interpreter is a built-in feature that is provided by each browser and utilized to interpret the code. JavaScript doesn't need to be compiled before it's used.

Application of JavaScript

There are multiple applications of JavaScript, some of them are as follows:

Web Development

JavaScript is integral to web development, playing a crucial role in creating responsive and engaging websites. It works with HTML and CSS to add functionality and interactivity to web pages. Many websites are made with the help of JavaScript, like Google, Facebook, Yahoo, Twitter, Amazon, Wikipedia, LinkedIn, YouTube, etc.

Server Applications

JavaScript also helps users to create server-side applications. With the use of Node.js in JavaScript, we can create server-side applications. Some of the big companies such as PayPal, GoDaddy, etc., utilize Node.js for server apps.

Game Development

It also helps developers create games on the web. We use both HTML5 and JavaScript together to develop games. With the help of libraries like Ease JS, developers can create an interactive game for the web.

Web Applications

Web applications are created with the help of JavaScript. The frameworks of JavaScript, such as Angular, React, etc., are utilized to build robust web apps.

Smartwatch Applications

Smartwatches are getting popular these days as they act as a substitute for mobiles. JS libraries like Pebble are utilized for creating apps for smartwatches.

Frameworks and Libraries of JavaScript

ReactJS

It is a popular JavaScript library that Meta and the community developed. The original author of ReactJS was Jordan Walke. It is a free and open-source front-end JavaScript library, which means anybody can utilize this framework without paying a single penny.

JQuery

JQuery is one of the oldest frameworks of JavaScript. It was originally authorized by John Resig. It is a free and open-source library that is used to create simple web applications. It helps simplify HTML DOM elements, Ajax, CSS animations, and event handling.

Vue.js

Vue.js is an open-source framework that is utilized to make user interfaces and single-page applications. It was originally authorized by Evan You and was initially released in February 2014.

AngularJS

AngularJS is a robust, free, and open-source JavaScript-based framework that Google developed. AngularJS is used to simplify development and testing applications, and it is utilized as the front-end of the MEAN stack.

Express.js

Express.js is a fast and open-source backend web application framework that TJ Holowaychuk, StrongLoop, and others developed. The main use of Express.js is to create complex web applications and APIs. It has become the prime choice when using the Mean stack.

Ember.js

Ember.js is an open-source framework that was initially released on December 8, 2011. It is used to create scalable SPAs. It is used on various websites such as Nordstrom, HashiCrop, Apple Music, Live Nation, Twitch, Intercom, Ghost, Square etc. With the use of this framework, developers can create desktop and mobile applications.

Prerequisite

Before learning JavaScript in depth, you must have the basic knowledge of HTML.

Audience

We have developed this JavaScript tutorial for beginners and professionals both. There are given a lot of examples with JavaScript editor. So, you can easily edit your JavaScript code which will help you to learn JavaScript easily.

Problem

We assure you that you will not find any problem in our JavaScript tutorial. But, if you find any mistake, you can post it in our comment section.